Commitments - Additional Information (Details) $ in Billions	12 Months Ended
	May 31, 2022 USD ($) AirCraft
Other Aircraft Commitments Disclosure [Abstract]
Deposit and Progress Payments | $	$ 1.3
B777F [Member]
Other Aircraft Commitments Disclosure [Abstract]
Conditional Aircraft Commitments	2
B767F [Member]
Other Aircraft Commitments Disclosure [Abstract]
Conditional Aircraft Commitments	2